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One-dimensional calculation method considering centrifugal fan impeller working capacity during natural prewhirl

A technology of centrifugal fan and calculation method, which is applied in calculation, computer-aided design, special data processing applications, etc., can solve the problem that the centrifugal fan cannot reach the amount of work, so as to reduce the workload of performance test correction, reduce calculation errors, and avoid The effect of insufficient work

Active Publication Date: 2020-09-18
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

Therefore, if the import pre-rotation (v 1u = 0) with the traditional one-dimensional simplified calculation method, the calculated work capacity of the impeller is often higher than its actual work capacity, resulting in the designed centrifugal fan not reaching the required work capacity in actual operation. Performance tests are iteratively corrected

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  • One-dimensional calculation method considering centrifugal fan impeller working capacity during natural prewhirl
  • One-dimensional calculation method considering centrifugal fan impeller working capacity during natural prewhirl
  • One-dimensional calculation method considering centrifugal fan impeller working capacity during natural prewhirl

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Embodiment 1

[0056] Such as figure 1 and figure 2 As shown, the present invention provides a one-dimensional calculation method for the working capacity of the centrifugal fan impeller when considering the natural pre-rotation, including: 1) considering the influence of the natural pre-rotation of the inlet existing in the actual centrifugal fan on the working capacity of the impeller, the Stodola's method of dealing with airflow slippage at the impeller outlet is applied to the impeller inlet; 2) through the simplified peripheral velocity coefficient φ of the Euler equation in the original one-dimensional calculation method 2u Correction is carried out, and the modified peripheral velocity coefficient φ′ is proposed 2u ; 3) The peripheral velocity coefficient φ' will be corrected 2u Correlating with impeller inlet and outlet diameters, inlet and outlet blade installation angles, number of impeller blades, fan speed and flow parameters, a new one-dimensional calculation method for centr...

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Abstract

The invention provides a one-dimensional calculation method considering centrifugal fan impeller working capacity during natural prewhirl, which comprises the following steps of: considering the influence of inlet natural prewhirl in an actual centrifugal fan on the impeller working capacity, and applying a method for processing centrifugal impeller outlet airflow slippage by Stodola to an impeller inlet; by correcting a simplified cycle speed coefficient phi < 2 > u of an Euler equation in an original one-dimensional calculation method, a corrected cycle speed coefficient phi '< 2 > u considering the natural prewhirl influence is proposed; and directly correlating the corrected cycle speed coefficient phi '2u with the inlet and outlet diameters of the centrifugal impeller, the inlet and outlet blade mounting angles, the number of impeller blades, the fan rotating speed and the flow parameters, and deriving and proposing a novel one-dimensional calculation method considering the actingcapacity of the centrifugal fan impeller when the inlet is naturally pre-rotated. According to the novel calculation method, the accuracy and reliability of one-dimensional scheme design of the centrifugal fan are remarkably improved; the workload of fan test correction in the product development process is reduced, the degree of dependence of centrifugal fan one-dimensional scheme design on design experience of research and development personnel is reduced, and the method has the advantages of being simple in mathematical formula, clear in physical significance, easy to apply to engineeringdesign and the like.

Description

technical field [0001] The invention belongs to the field of one-dimensional aerodynamic design of a centrifugal fan, and in particular relates to a one-dimensional calculation method considering the working capacity of a centrifugal fan impeller when natural pre-rotation is considered. Background technique [0002] When using the efficiency method to carry out the aerodynamic design of the centrifugal fan, it is first necessary to carry out the scheme design and detailed calculation according to the one-dimensional design method. The one-dimensional design method is widely used in the fan industry at home and abroad. As the core basic link of the three-dimensional design, the quality of the one-dimensional design scheme will have a crucial impact on the design quality of the final three-dimensional product. Among them, the calculation of the working capacity of the impeller is a key link in the one-dimensional scheme design, and its accuracy and reliability will directly de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F113/28
CPCG06F30/17G06F2113/28
Inventor 韩凤翚王哲李文华
Owner DALIAN MARITIME UNIVERSITY
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